feat: update design page video content

Author: Daniel528

2020/resources/dashboard.mp4

@@ -50,14 +50,14 @@ export function DesignPage() {
 
       <Video
         id="playground"
-        videoSrc="./resources/playground.mp4"
-        caption="Micromelon coding environment used to program robots and manage projects."
+        videoSrc="./resources/mobile-code-editor.mp4"
+        caption="Micromelon Mobile Code Editor used to program robots and manage student work."
       />
 
       <Video
         id="dashboard"
-        videoSrc="./resources/dashboard.mp4"
-        caption="The teaching dashboard used by teachers to manage their school and classes."
+        videoSrc="./resources/micromelon-junior.mp4"
+        caption="Micromelon Junior, a platform for younger students to learn programming."
       />
 
       <h2>Micromelon Challenges & Process</h2>